gure he anatomy of some of the endocrine glands. (b)An islet of Langerhans within the pancreas Chapter 11 ENDOCRINE SYSTEM Pituitary Thyroid gland Parathyroid glands (behind thyroid gland Pancreas Ovary Creek Testis
1 Chapter 11, ENDOCRINE SYSTEM
Section 1 Introduction I. Concept of Hormone a hormone --chemical substance secreted into the interstitial fluids by one specialized cell or a group of cells --exert physiological control effect on other cells of the e body
2 Section 1 Introduction I. Concept of Hormone A hormone – --chemical substance --secreted into the interstitial fluids by one specialized cell or a group of cells --exert physiological control effect on other cells of the body
l Endocrine Vs Nervous syste
3 II. Endocrine vs. Nervous Syste
Nervous system exerts point-to-point control through nerves ° Similar to sending messages by conventional telephone electrical in nature and fast
4 Nervous system •exerts point-to-point control through nerves, •similar to sending messages by conventional telephone. •electrical in nature and fast
Hormones travel via the bloodstream to target cells .broadcasts its hormonal messages to essentially all cells by secretion into blood and extracellular fluid requires a receiver to get the message cells bear a receptor
5 Hormones travel via the bloodstream to target cells •broadcasts its hormonal messages to essentially all cells •by secretion into blood and extracellular fluid. •requires a receiver to get the message – •cells bear a receptor
III. Transportation of Hormones 1. Endocrine, or telecine T arget cel Secreting cell Blood vessel Target cell
6 III. Transportation of Hormones 1, Endocrine, or telecrine:
Transportation of hormones 2. Neuroendocrine Structural and functional relationships of the pituitary and Metos .lypowraiam c in the venta el ons in me conec ng stak na amic tycoon sea tract t pophyseal I typaphysei porta system Neurohypophysis storage arca fcr Secordary Posteror adenohypcpr yss Oxytocin ISH FSHLH Aa
7 2, Neuroendocrine: Transportation of Hormones
Transportation of hormones 3. Paracrine Receptor Secreting cell Target cell Not a target cell (no receptors)
8 3. Paracrine Transportation of Hormones
ep AdenohypophysIs - hypophyseal Pituita hypophysis vessels ACTH ACTH FSH ADH arg Gut horr Telecrin Autocrine Intracrine Solinocrine
Solinocrine Autocrine Intracrine
IV Classification of hormones 1. Proteins and polypeptides, including hormones secreted by anterior and posterior pituitary gland pancreas(insulin and glucagon) parathyroid gland(parathyroid hormone) many others Insulin [51 amino acids
10 IV. Classification of Hormones 1. Proteins and Polypeptides, including hormones secreted by anterior and posterior pituitary gland pancreas (insulin and glucagon) parathyroid gland (parathyroid hormone) many others